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26.6

was my average MPG from West Bend to Oak Creek today. Hand calc and DIC always seem to be within a tenth. My first good freeway run since being fully synthetic in the engine, trans, front/rear ends and t-case.

Cruise was on 5 over the whole way so about 50% at 60mph and 50% at 70mph. A/C blasting the whole way. Bone stock too no additives!

If I dumped the DPF that screws me out of 2 gallons of fuel every tank and got a tuner with a economy tune in it, could probably crack 30. But GM was kind enough to install a "big brother" into the ECM of these new LMM trucks that keeps track of the last 10 flashes...

yeah no need to lose your warranty. just remember with a tuner your dic will be off for gas mileage. miles driven is fine but the mpg is off by about 2. thats what mine is off with my ppe. i still am getting 18-20 mixed and 24+ on solid freeway trips. i just filled up at that shell yesterday so well see what my mileage is with the special mix. lol

Hand Calculated I've never hit more than 20.5. Then again I never drive that slow and most of my road trips are at 75-80mph.

Stock with a 85HP Predator tune, I never hammer it so I figure its safe and best for economy.

I want to do an exhaust and do a road trip at lower speeds just to see what's possible. I just don't think I have the patience. The trip to the in-laws is 10 hours and I just try to make it go as quick as possible. Plus its 75mph all the way through MI.

thats crazy. atleast they have that lmm figured out. when i had a 08 ford 6.4 CC SB plow truck that thing got 6mpg with a 8' plow on the front if they would go back to a lock out style front end on ford or dodge the fuel mileage would greatly increase